Phonograph clutch



Dec. 27, 1932. v v. 1 FRYKMAN 1,892,269

PHoNoGRAPH CLUTGH Filed Aug. 9. i928 2 sheets-sheet 1 k E N QQ 'mk Q N QQ m QQ 9 w Il-- il i @o N QQ f Il' QN?.

B iv AQ? 1 N |j N s," I I UL I l N n N -s ik* INVENTOR- Dec. 27, 1932. v. L. FRYKMAN 1,892,269

, PHONOGRAPH CLUTCH Filed Aug. 9, 1928 2 Sheets-Sheet 2 INVENToR: VctorLFrg/man) Patented Dec. 27, 1932 UNITED STATES PATENT OFFICE VICTOR L. FRYKMAN, OF'BRIDGIORT, CONNECTICUT, ASSIGNOR IC DICTAPI-IONE COR- PORATION, OF BRID'G-EPORT, CONNECTICUT, A CORPORATION CF NEW'YORK Y PHONOGRAPH CLUTCH Application led August 9, 1928. Serial No. 288,504.

This invention relates generally to phonograplis, and moreparticularly to a Vclutch mechanism for controlling the movement of the record supports thereof.

It is an object of this invention to provide a compact clutch in which a portion of the operating power is suppliedV by the driving motor.

Other objects and advantages of the invention will appear hereinafter.

The accompanying drawings and the description thereof disclose one illustrative embodiment of the invention as applied to a dictation machine.

In the drawings:

Fig. 1 is a diagrammatic front View of a dictation machine including a motor, and shows in vertical sect-ion a clutch mechanism illustrating this invention mounted on the motor;

Fig. 2 is a top plan view of the clutchA disclosed in Fig. 1;

Fig. 3 is a sectional view on line 8 8 of Fig. 1, and includes additionally a wiring n diagram for the motor and clutch control;

and y Figs. 4 and 5 are sectional views on line 4-4 of Fig. 1, and show the clutch disengaged and engaged respectively.

In Fig. 1, which discloses the invention applied to a dictation machine in common usage, the casing 9 supports the top plate 10. The top plate 10 is provided near its left hand end with an upwardly projecting housing 11 having a suitable bearing for supporting the mandrel shaft 12. The right hand end of the shaft 12 carries the record mandrel 18, and the left hand end of this shaft has fixed thereon a pulley 14.

Also mounted upon the top plate 10 and adapted to travel longitudinally of the man* ldrel 13 is a carriage 19 which supports a sound boX 18. The sound boX 18 carries a stylus or styli, (not shown) for recording or reproducing dictation on a record carried by the mandrel 13. rI`he carriage 19 is arranged to travel co-ordinately with the mandrel rotation'by connection with a feedscrew 20 which is driven by the mandrel shaft 12 through any suitable vdriving means mounted within the housing 11.

As shown in the left hand end of Fig. 1, engaging the pulley 14 is a belt 15, which eX- tends through an opening in the top plate 10 to a pulley 16 mounted on the left hand end of the short intermediate or stud shaft 25. The right hand end of the shaft 25 is connected through a clutch, hereinafter described, to the shaft 6 of the driving motor 17. The motor 17, which has been disclosed as an electric motor, is carried by the plate 8, to which it may be fastened by the screws 7. The plate 8 may be suspended in any suitable manner, preferably resiliently, through means such as the springs 21 attached to theunderside of the top plate 10.

At the left hand end of the motor 17 a bracket 26 is secured to the motor frame by means of the screws 31. The bracket 26 has a suitable central bearing which supports the shaft 25. Fixed to the inner end of the shaft 25 by means of a set screw 80, is the sleeve 29, which is also rotatably supported on the outer end of the motor shaft 6, the sleeve 29 surrounding the adjacent ends of the shafts 6 and 25.

.In the lower part of the sleeve 29 a pin 28 is mounted transversely to the axis of the shaft 25, and a latch 27 is pivotally mounted on the pin 28. The lower edge ofthe latch 27 is provided with a projecting abutment 87, the purpose of which will appear hereinafter. Bearing downwardly against the left hand end of the latch 27 is a pressure spring 32, which is held in place in a transverse opening through the shaft 25 by means of the screw 30. 1

In Fig. 1 the spring 82 tends toV turn the latch 27 in a counter-clockwise direction about, the pin 28. When the latch 27 is rptated sufiiciently under the pressure of the spring A82, the right hand end of the latch, as may be seen in Fig. 5, engages a depending lug 38 on a drive-dog 28, which latter is fixed to the lefthand end of the motor shaft 6 yby the pin 24. When the latch 27 and the lug 38 are engagedthe shaft 25 is connected to the motor shaft 6 so that operation of the motor will turn the shaft 25.

Extending below the adjacent ends of the shafts 6 and 25 is a camming lever 34, the structure and operation of which may be best Seen in Figs. 2, 3, 4 and 5. Referring particularly to Fig. 3, it will be observed that the camming lever 34 is pivoted at 35 so as to swing downwardly from or upwardly toward the latch 27. In the position shown in Figs. 1, 2, 3 and 4, the lever 34 is in contact with the latch 27 and serves to hold the latch 27 out of engagement with the lug 33, leaving the motor disconnected from the r shaft 25. But when the lever 34 is turned downwardly away from the latch 27, the latch, under the influence of its spring 32, makes engagement with the lug 33, thus con- 25, necting the motor with the shaft 25.

The disconnecting action is made possible by the formation of the free end of the lever 34 which, as best shown in Fig. 2, is tapered to form a cam, against which the downwardc j ly projecting abutment 37 on the latch 27,

rotating with its associated parts, will impinge when the lever 34 is raised to the position shown in Figs. 3 and 4. When the abutment 37 engages the camming surface 36,

\ the further rotation of the shafts and 6 and of the sleeve 29 causes the latch 27 to be turned about its pivot pin 28 gradually, with the expenditure of a comparatively small amount of power, until the latch disengages the lug 33, thereby disconnecting the shafts 25 and It is apparent that with this arrangement the power of the driving motor is utilized to operate the clutch to disengage the two shafts. This feature is of particular importance ina dictation machine where it is highthe control devices as ly desirable to have small and compact as possible.

As may be best seen in Figs. 1, 2 and 3,

the camming lever 34 is provided adjacent one end of the camming surface 36 with an abutment 38, which engages'the abutment 37 on the latch 27 when the latch reaches a predetermined position in its rotation. This engagement of the abutments 38 and 37 serves to stop the shaft 25 and to prevent further rotation thereof when the shafts 25 and 6 are disconnected.

Figs. 2 and 3 disclose both manual and electric means for controlling the clutch mechanism. Connected to the right hand end of the lever 34, by a pin and slot connection 43, is a bar 41, which may conveniently take the form of amarmat-urefor an electromagnet. The right hand end of the bar 41 is pivoted at 42 on the U-shaped member 5, and the bar 41 may have Va suitable extension handle projecting outside of the casing 9, so as to permit manual operation of the camming lever 34.

The member 5 may be carried by the plate 8, and the member 5, in conjunction with the armature 41, substantially completes a magnetic circuit for the electromagnet core 99 and the coil 39 carried thereby.

When the electromagnet 39 is cle-energized, as is normally the case, the armature 41 falls away from the core 99 by gravity. When the armature 41 is in this position the lever 34 is turned about its pivot to a position in which the camming surface 36 engages the abutment-37 on the latch 27 to disconnect the shafts 25 and 6. The U-shaped member 5 may be provided with a screw 4 and a lock nut 3 variably to control the position of the armature 41 when the electromagnet 39 is deenergized. A

Energization of the electro-magnet draws the armature 41 toward the core 99, thereby turning the lever 34 about its pivot'35 to disengage the camming surface 36 and the abutment 37. Upon its release, the lever 27 is turned about its pivot by the spring 32 until it engages the lug 33 on the drive-dog 23 to lock 'the shafts 6 and 25 together.

As may be seen in F ig. 3, the electromagnet coil 39 is connected by means of the wires 44 and 45, the operators control switch 48, the wires 46 and 47 and the switch 22 to a suitable source of electricity, not shown. The wires 46 and 47 are also connected to the motor 17 to supply power thereto.y

It will be seen thaty this invention provides a compact clutchmechanism which may be assembled with the driving motor as a unit, and which requires a minimum expenditure of power by the operator for control there- 0 Y It will be understood that the invention may be variously modified and embodied within the scope of the subjoined claims.

I claim: A

1. The combination in a dictation machine, of a motor having a rotatable shaft, a drivedog iXed to one end of the motor shaft, a bracket mounted on one end of the motor, a second shaft rotatably supported by the bracket in end to end alignment with the motor shaft, means pivotally mounted on the second shaft and operable in a plane which is substantially coincident with the axis of the shaft and adapted to engage the drive-dog to connect the two shafts, and means for actuating the dog-engaging means to disconnect the two shafts.

2. The combination in a dictation machine, of a motor having a rotatable shaft, a drivedog fixed to one end of the motor shaft, a second shaft rotatably supported in alignment with the motor shaft, means comprising a pivoted lever mounted longitudinally on the second shaft normally tending to engage the drive-dog to connect the two shafts, means for rocking said lever about its pivot to dis- 'engage the drive-dog and disconnect the shafts and means for adjusting the position of said rocking means relative to said lever.

3. In combination in a device of the character described, a motor having a rotatable shaft, a drive-dog fixed to one end of the motor shaft, a second shaft rotatably supported in alignment With the motor shaft, means comprising a lever pivotally mounted on the second shaft adapted to engage the drive-dog to cause the second shaft to be rotated upon rotation of the motor shaft, said leveroperating in a plane Which is substantially coincident With the axis of the shaft, yielding means tending to turn the lever into engaging position With the drive-dog, and adjustable means for moving the lever out of engagement With the drive-dog.

4. The combination in a dictation machine of a motor having a rotatable shaft, a second shaft in end to end axial alignment with the motor shaft, a clutch member carried by each shaft, one of said members having a peripherally extending drive-lug, the other of said members carrying a spring pressed lever mounted longitudinally of the shafts and adapted normally to engage said lug to drive said second shaft, and a member pivotally mounted adjacent said motor having a cam face adapted to engage said lever as the shafts rotate to disengage said lever fro-m said lug.

5. The combination in a dictation machine of a motor having a rotatable shaft, a second shaft in end to end axial alignment with the motor shaft, a clutch member carried by each shaft, one of said members having a peripherally extending drive-lug, the other of said members carrying a spring pressed lever operable in a plane Which is substantially coincident With the axis of said shaft and adapted normally to engage said lug to drive said second shaft, a member pivotally mounted adjacent said motor having a cam face adapted to engage said lever as the shafts rotate to disengage said lever from said lug, and means for actuating said pivotally mounted member to Withdraw said cam face to an inoperative position.

6. The combination in a dictation machine of a motor having a rotatable shaft, a second shaft in end to end axial alignment with the motor shaft, a clutch member carried by each shaft, one of said members having a peripherally extending drive-lug, the other of said members carrying a spring pressed lever operable in a plane Which is substantially coincident With the axis of said shaft and adapted normally to engage said lug to drive said second shaft, a member pivotally mounted adjacent said motor having a cam face adapted to engage said lever as the shafts rotate to disengage said lever from said lug, and adjustable means for actuating said pivotally mounted member to withdraw said cam face to an inoperative position.

In testimony whereof, I have signed my name to this specification this 27th day of August, 1928.

VICTOR L. FRYKMAN. 

